System /nstallation
Guide
Prestige
THX9321
or ElM:
Using
universal
relays
to control
heating
or cooling
Powering
universal
relay
with
system
transformer
(THX9321 shown)
Transformer
24
C
HEAT STAGE 3 or
_
©Re
o
®u,:u_
®U,:iA
_U2 _i
_U2
2 =T'_
MCR32952
Powering
universal
relay
with
separate
heating transformer
(THX9321 shown)
Transformer
C
A!
9 RC
8
9U_i
Transformer
_ U2
; "_
DU_ ::rA
MCR32953
A
U1/U2/U3terminals are normallyopen dry contacts when set up for a stage 01heatingor cooling.
A
Youmust install a fieldjumper if the stage of heatingor cooling is poweredby system transformer.Do NOT installa field
jumper if the stageof heatinghas its own transformer.
_
U1/U2/U3 terminals are assigned to a stage of heating or cooling inthe Installer Setup. Options are:
•
Heat -- Stage 3 (last stageof heating)-- ISU 2100, 2140, or 2170
•
Cool; Stage3 -- ISU 2080
•
Cool; Stage4 -- ISU 2090
•
Geothermal radiant heat: Stage 1 -- (seewiring guide on pages 12-13)
•
Geothermal radiant heat: Stage 2 -- (seewiring guide on pages 12-13)
69-2490--03
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